Prompt

We think this document is hiding something. Can you find what is hidden?

Walk-Through

This challenge provides you with a .docx file which is a Microsoft Word document and requires you to extract hidden information from the file.

Once you download the file and try to open it (using Microsoft Word or Google Drive), you’ll see that the document itself seems to be holding 4 unimportant images with no sensitive information inside it and that is indeed the correct observation. So now we need to find the actual hidden information.

A Microsoft Word document, or .docx extension file is actually a ZIP compressed archive! This means that if you rename the file from a .docx extension to a .zip extension (e.g. mv file.docx file.zip), you can actually decompress the archive and extract its contents! Once extracted using a command such as unzip file.zip or using the OS built-in GUI tool, you’ll find that there is a directory named word inside the archive which contains all the relevant files for the Word document. Navigate into the word directory and inspect the various files and directories and you’ll find that there are 5 images stored in the media directory (the Word document only had 4 images when you opened it earlier), so one of these 5 images is likely the hidden information! Try to open each image until you find one that is holding a flag!

Questions

What is the name of the hidden file containing the flag?

Inspect the contents of the decompressed archive to find a PNG image file

What is the flag?

Open the image file to find the flag

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